Windshield wiper



` Feb. 18, 1941, A. sci-:Mm

l WINDSHIELD wIPER Filed March 5, 1940' Algrney Patented Feb. 18, 1941 UNITED STATES PATENT OFFICE WINDSHIELD WIPER Anton Schmid, Stuttgart, Germany, assignor to Robert Bosch Gesellschaft mit beschrnkter Haftung, Stuttgart, Germany application March 5, i940, serial No. 322,29? In Germany March 1, 1939 double crank, the links for the wiper arms' being supported rotatively at the cranks.

'I'he primary object of the invention is to provide a simple, inexpensive and compact windshield wiper of this kind, capable of emcient, reliable and durable operation. These and other advantages of the invention will be apparent from the accompanying drawing, taken in connection with the following description, showing as an example two embodiments of windshield wiping mechanism in which the arms are oscillated in opposite directions through equal angles. In the drawing, Fig. 1 shows a windshield wiper having a double crank journaled on one side only; Fig. 2 shows a double crank with a counter bearing; and Fig. 3 shows the windshield wiper installed on the windshield of a moving vehicle.

Referring to the embodiment of Fig. 1, secured to the drive shaft I of the windshield wiper motor 2 is a crank 3. Into the outer end of this crank a bearing pin 4 is inserted and pinned. On this pin is rotatively mounted a link 5 provided with outer ends of the an end socket, as shown in broken lines, for telescopically'receiving a link 6. To the other end of the bearing pin 4 is pinned a crank 1 which extends oppositely to and has a length double that of the crank 3. At the other end of the crank 1 is secured a ball shaped pin 8 acting as a journal for a second link and forming a, ball and socket connection therebetween. AThe sec- P ond link comprises the portion 9 which has an end socket into which extends the portion III as shown in broken lines. The arm I rotates about the axis of the motor drive shaft I and the arrangement is Isuch that the distances a and a are equal.

In the embodiment of Fig. 2, a" third crank II is pinned to the end of bearing pin- Il and. is provided with a journal that extends into the counter bore 2 arranged axially of shaft I. As in the case of the link 5, 6, the other llnk- I8, Il!I is mounted rotatively on the bearing pin I1.

As shown in Fig. 3, the links 6 and I0 are vloosely connected with the wiper arms I3 and I4 which are pivoted at l5 and I6, respectively. Thearrows indicate the simultaneous movement of the lwiper arms and the cranks, and the broken lines show an intermediate position thereof.

In assembling the double crank, the bearing pin 4 of either embodiment is iirst pinned to the crank 3, then the link 5 is pushed onto bearing pin 4, fitting rotatively thereon. The crank 'I is then pinned to the outer end of the bearing pin 4. The remaining assembly will be obvious, from which it will be understood that the construction is simple and the assembly of the parts may be accomplished rapidly andinexpensively.

I declare that what I claim is:

A transmission mechanism for operatively connecting a rotatable shaft to a pair of pivoted members having their pivots fixed relatively to said shaft, comprising a crank fastened to said shaft, an oppositely extending crank, a bearing pin rigidly fastening the two cranks in spaced relation axially of said shaft, a second bearing pin rigidly fastened to and extending outwardly of the outer end of said oppositely extending crank, and links loosely and directly connected to the respective bearing pins and also to the 

